Rare Components in Cosmic Rays with AMS-02 TAUP Sendai Sep.07 Andreas Sabellek IEKP - Universität Karlsruhe (TH) for the AMS Collaboration Univ. of Karlsruhe

Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 2 The AMS Project: History and Future again ready for launch 10 days Precursor Flight on board the Space Shuttle Discovery 3 years on the International Space Station ISS with 1000-times higher statistics measurement M. Aguilar et al., Physics Reports, vol. 366/6 (Aug.2002), pp Spectra of primary and secondary p,e and He Superconducting magnet and new subdetectors for better particle identification: Precise antimatter and heavy nuclei fluxes measurement AMS-02 AMS-01 Alpha Magnetic Spectrometer

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 3Outline AMS-02 Experiment on board the ISS Science with AMS-02 and Achievement Potential –“Standard Cosmology”: Cosmic Ray Spectra and Composition –Gamma ray astrophysics –Indirect Dark Matter Search –Direct Search for Antimatter (a heavy Anti-nuceus) –Search or Exotic Matter: Strangelets, … Flight Status and Summary AMS-02 will record about 2 * physics events from comic rays in 3 years and identify its rare components with excellent paticle identification

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 4 The AMS-02 Detector Redundant measurement in different subdetectors to gain precision Dimensions: 7 tons and 3x3x3.5 m 3 Acceptance: 0.5m 2 sr Lifetime (cryomagnet): min 3 years

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 5 Flight Subdetector Hardware 8 Plane Silicon Tracker: 200,000 channels on 6.6m 2 strips Resolution  30µm and 10µm in bending direction Rigidity measurement up to few TeV Particle identification by dE/dx ~Z 2 Measurement of gammes in conversion mode B Superconducting Magnet: Field 0.86 Tesla; 5.2 MJ stored NbTi/Copper conductor I~460A; Cooled to 1.8K by 2500l Superfluid Helium From 120 GeV/c muon beam Anticoincidence counters: 16 cylindrical shell paddels of plastic scintillator for veto

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 6 Flight Subdetector Hardware 2 m Transition Radiation Detector: 20 layers, 5248 strawtubes with Xe/CO 2 1bar Fleece radiator for electron/proton separation e/h rejection > 100 dE/dx measurement Time of Flight: 2x2 scintillator planes as primary trigger Resolution t<130ps Velocity measurement d  /  ~3% dE/dx measurement

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 7 Flight Subdetector Hardware Electromagnetic Calorimeter: 18 planes (640kg) of Pb with scintillator fiber inserts; thickness 16X 0 /.5 h e/p separation ~1000 to 1Tev Ring Image Cherenkov Detector: NaF (n=1.336) and Aerogel (n=1.035) radiator PMT’s array of spatial pixel size 8.5x8.5 mm  measurement up to 20GeV/n Charge measurement up to Z=26 (N  ~Z 2 ) Space qualified electronics running with 650 micropocessors to read out channels, GPS, Startracker Camera and heat control systems. Radiator (NaF and Aerogel) Reflector PMT array dE/E= /SE[GeV]

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 8 Photon Detection with AMS-02 Single photon mode Conversion mode   EM Shower   e + /e - -pair Energy resolution (100GeV) ~3% Angular resolution (100GeV) ~0.02° %

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 9 Chemical Composition Measurement Cosmic spectra with 1% accuracy from Helium to Cobalt Test results from accelerator 158 GeV/n dE/dx~Z 2 N  ~Z 2 Abundance of cosmic nuclei p BNePCa Mn Co

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 10 Precision Study of Cosmic Rays – Radioactive Isotopes AMS-02 will collect Be isotopes in 3 years Half-life of 10 Be in the order of confinement time Information about –Confinement time –Galactic halo size … and collect 10 5 C and 10 4 B to measure the ratio of Carbon to its spallation secondary Boron up to 1TeV/n Information about –Amount of matter traversed –Diffusion (to understand propagation and to fix free parameters of models)

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 11 Isotope Identification AMS-02 can destinguish 4 He and 3 He There is room for discoveries in different channels –Unexpected result from AMS-01: He Isotopes are completely separated AMS-02 is also a long duration cosmic radiation monitor (e.g. solar modulation) from AMS-01

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 12 Diffuse Gamma Rays and Sky Survey Two complementary modes for Gamma detection Main source: cosmic ray interaction with gas (Pion decay, Bremsstrahlung, Inverse Compton) Information about –Interstellar matter –Accelerating processes and origin of cosmic rays in ‘standard’ astrophysics

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 13 Probe the Unknown Dark Energy ~73% Matter ~27% –~4.4% Barions (~0.5% Stars) –23% Cold Dark Matter Leading idea is some kind of not-yet-seen stable particle (WIMP candidate: Neutralino as lightest SUSY-particle in R-conserving model) Direct search on Earth ongoing (if the Earth not in a void, results expected) Indirect searches are based on   bb quark pair production in annihilation, its decay then is well known from accelerator experiments From CMB + SN1a + structure formation

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 14 Search for Cold Dark Matter Annihilation J.J Beatty et al., PRL 93 (2004) (Projected spectrum from cosmic ray collisions) AMS-02 will at the same time measure p - and e + spectra, which may contain an antimatter excess from annihilating dark matter particles Antiprotons Antielectrons

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 15 Dark Matter Fit in different Sky Directions 3 components gamma spectrum: galactic background + extragalactic bg + DM annihilation fitted simultaneously with same WIMP mass in all directions. inner Galaxy outer discouter Galaxy low latitudeintermediate lat.galactic poles Univ. of Karlsruhe EGRET DataW. de Boer et al.

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 16 Dark Matter Ring Interpretation Univ. of Karlsruhe Fit in 180 directions implies substructure in the galactic distribution. Observed rotation curve of our galaxy then can be very well explained with obtained dark matter profile. Inner ring (coincidences with H 2 ring) Outer ring (coincidences with orbit of dwarf galaxy, which looses mass by tidal forces)  Promising hint for annihilation of 60 GeV WIMP from Gamma rays: Verification of EGRET data necessary!  Theory could allow to predict mass spectrum of SUSY from annihilation, which could be checked with accelerators. W. de Boer, C. Sander, V. Zhukov, A. Gladyshev, D. Kazakov, EGRET excess of diffuse Galactic Gamma Rays as Tracer of DM, astro- ph/ , A&A, 444 (2005) 51

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 17 Combined Analysis – Charged Particles Positrons Antiprotons Positrons Signal Background Signal Background Univ. of Karlsruhe Fluxes of Positrons and Antiprotons dependent on propagation models, but Dark Matter Annihilation with same Halo and WIMP parameters from Gamma Rays could (as input) be used to tune cosmic models, e.g. introduce unisotropic diffusion.

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 18 Search for Neutralino DM with Anti-Deuterons Antideuterons in standard astrophysics are produced with high energies, whereas antideuterons from Neutralino annihilation can be found below 1 GeV. This is more promising than antiprotons since easier extraction of SUSY signal (orders of magn.!!). 3-years from F, Giovacchini (2007) Antideuterons A large acceptance spectrometer like AMS-02 is required to measure the extremely low fluxes.  SUSY /  sec 1 10

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 19 Kaluza-Klein Bosons as Dark Matter Candidates Excess from possible Boson mass of 300 GeV can be seen by AMS-02 H.C.Cheng, J.L.Feng and K.T.Matchev, Phys.Rev.Lett V89, N21 (2002) ; J.Feng,Nucl.Phys.Proc.Suppl.134 (2004) 95 Low Scale Quantum Gravity (extra-dimensional) predicts Bosons with mass, allowing direct annihilation into e +/ e - pairs (dominant channel ~20%).  steep spectra from BB collisions are different from neutralino annihilation

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 20 Search for the existence of Antimatter in the Universe Up to today existance of antimatter domains in the universe is not excluded (predicted by Big Bang) No antimatter annihilation signal from within our cluster No antimatter particle found by AMS-02 means there is no Antimatter in the Universe A single anti-C: there are antimatter stars! He/He (CL 95%) The primordial antimatter content of the Universe is unknown.

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 21 Example for Exotic Matter in the Universe: Strangelets Could there be another new type of matter? Z/A < 0.12 Stable strange quark matter was first proposed by E. Witten, Phys. Rev. D, (1984) Z~0.3A 2/3 Signature of a Strangelet event simply is anomalous Z/A STRANGELET Nucleus u u u u ud u d d d d d s s s s s s One anomalous event was reported by AMS-01 (background probability <10 -3 ), compatible with a Strangelet.

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 22 AMS-02 Flight Status Final Detector Intergation at CERN,Geneva cleanroom in progress … and completed for detector test at ESTEC,NL space simulating chamber in Summer 2008 AMS-02 is strongly supported by NASA and on schedule for delivery to KSC, Florida in December 2008 Jul.07 today ISS constuction continued ‘06 CERN Cleanroom Kennedy-Space-Center

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 23Summary AMS-02 perfectly complements current big experiments in exploring new physics and is a general purpose instrument It will take high statistics and long duration cosmic ray data on board ISS and is ready for launch early 2009 It will provide simultaneous measurements to –tune parameters of current cosmic models –allow combined dark matter search on matter/antimatter ratios and Gamma ray spectra AMS-02 will strongly extend limits on direct searches for heavy Antimatter as well as exotics in the Universe Thank you!

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 24Backups

Univ. of Karlsruhe 11/09/2007TAUP 07, SendaiAndreas Sabellek p. 25 Current Experiments R. Battiston, Direct Measurements and Origin of CR, ICRC,2003